Abstract
The chemical structure and condensation of eastern cottonwood (Populus deltoides) enzymatic lignin were investigated by wet-chemical and spectroscopic techniques. A cocktail of carbohydrate digesting enzymes were used to hydrolyze the polysaccharides of P. deltoides wood. The chemical structure of biochemical purified lignin was elucidated by 2D 1H–13C HSQC correlation NMR and quantitative 13C NMR analysis. The monomeric compositions of enzymatic lignin were analyzed by derivatization followed by a reductive cleavage method to allow a quantitative determination of different monomeric products in lignin. The results indicated that enzymatic lignin had more uncondensed structures compared to milled wood lignin which could be a consequence of lower oxidation during the extraction process. The contribution of H:G:S units in P. deltoides were in the order of 5:60:35, respectively. Also, the amount of β-O-4/α-OH structures as the prominent moieties of lignin in enzymatic lignin was determined as 0.43/C9.
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